![]() Navy fired 76mm APCBC against homogeneous armor hardnesses from 250 to 490 Brinell, shatter gap penetration occurred at from 5% to 15% over 50% penetration limit, which is consistent with some of above results. ![]() If one uses 75L40 APCBC FH penetration as norm and estimates other rounds from it (using Krupp equation for FH penetration with 75L40 performance as standard):ģ7 APCBC about 3% low vs. And face-hardened penetration may fall off slower than homogeneous with velocity changes, according to Krupp equation and TM-9-1907. Sherman 75 penetrates 91mm homogeneous (same all the way thru and 240 Brinell hardness) at 0m, but 104mm face-hardened. This is a critical issue for wargaming and research because some APCBC rounds can penetrate much more face-hardened armor than homogeneous. German manufacturing used face-hardening on all front and side hull plates of 30mm to 50mm thickness till mid-1944, which might apply to 30+50 on StuG III, and a large number of panzers with 30mm-50mm on sides. Hard layer is supposed to break projectile nose, even when rounds have armor piercing caps that help to defeat face-hardening. penetration data in TM-9-1907 for face-hardened (FH) armor shows some unusual characteristics.įace-hardened armor has very thin layer of brittle, hard steel backed by ductile, non-brittle armor than absorbs impact and supports hard layer.
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